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Which setting can I modify to avoid the SF

Created by: xmnj at: 3/22/2019 1:52 PM (2 Replies)

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3/22/2019 1:52 PM	Rate (0)
xmnj Gold Member Joined: 9/30/2016 Last visit: 4/17/2023 Posts: 894 Rating: (6)	Please also see the attached screenshots. I have 2 Schmersal proximity sensors wired to 2 channels in a F-DI module (6ES7 326-1BK02-0AB0). Each of the proximity sensors has 2 switches and these are wired "to cross each other" in a way that I18.4 and I18.5 (duplicated for I18.6 and I18.7 for the other side5) both are activated when both sensors are activated and none of them are activated when no sensor are activated. Schmersal has issued a new version of the sensor (which they claim is identical to the old version except for using a better glue). The setup works without problems for 2 old version sensors and one new and one old version sensor. But when both sensors are new I get a signal fault on the F-DI module and even though the diodes for the two channels are activated on the F-DI module the signals are 0 in the PLC. The Diagnostic Buffer claims that there is either a short circuit or that there is a faulty power supply. Neither can be true since all is back in working order when one of the new version sensors are replaced with an old version sensor. Which setting(s) can I adjust (and how) to make it work with 2 new version sensors? Attachment 18136D.zip (89 Downloads)

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3/22/2019 2:45 PM	Rate (0)
mopS04 Platinum Expert Joined: 3/5/2014 Last visit: 8/5/2022 Posts: 5521 Rating: (1031)	hi Morten, there is a chanel-fault on the F-DI-module. I´m pretty sure there is a wiring-error. Check the wiring of the inputs and cross-check with the applications of the module in the manual if your wiring is correct. hope this helps, regards,
	FCK WAR! Be nice!
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3/25/2019 11:28 AM	Rate (0)
xmnj Gold Member Joined: 9/30/2016 Last visit: 4/17/2023 Posts: 894 Rating: (6)	Hi mopS04, Thank you for answering. I do however not understand how you can be right. The 2 sensors are sitting connected with connectors so no wiring is changed. It works with 2 old sensors. It works with an old and a new sensor. (no matter which one of the two old sensors that is replaced with a new one). But it does NOT work with 2 new sensors. It seems to me that the 2 new sensors somehow draws a bigger current and that this must be higher than some limit in the power supply. This produces the error. But can the limit be adjusted? Or can someone suggest another solution - perhaps even other sensors if necessary. mopS04 hi Morten, there is a chanel-fault on the F-DI-module. I´m pretty sure there is a wiring-error. Check the wiring of the inputs and cross-check with the applications of the module in the manual if your wiring is correct. hope this helps, regards,

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